.\" Access Control Lists manual pages
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.\" (C) 2002 Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
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.Dd March 23, 2002
.Dt ACL_VALID 3
.Os "Linux ACL"
.Sh NAME
.Nm acl_valid
.Nd validate an ACL
.Sh LIBRARY
Linux Access Control Lists library (libacl, \-lacl).
.Sh SYNOPSIS
.In sys/types.h
.In sys/acl.h
.Ft int
.Fn acl_valid "acl_t acl"
.Sh DESCRIPTION
The
.Fn acl_valid
function checks the ACL referred to by the argument
.Va acl
for validity.
.Pp
The three required entries ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER
must exist exactly once in the ACL. If the ACL contains any ACL_USER or
ACL_GROUP entries, then an ACL_MASK entry is also required. The ACL
may contain at most one ACL_MASK entry.
.Pp
The user identifiers must be unique among all entries of type ACL_USER.
The group identifiers must be unique among all entries of type ACL_GROUP.
.Sh RETURN VALUE
.Rv -std acl_valid
.Sh ERRORS
If any of the following conditions occur, the
.Fn acl_valid
function returns
.Li -1
and sets
.Va errno
to the corresponding value:
.Bl -tag -width Er
.It Bq Er EINVAL
The argument
.Va acl
is not a valid pointer to an ACL.
.Pp
The argument
.Va acl
does not point to a valid ACL.
.Pp
One or more of the required ACL entries is not present in
.Va acl .
.Pp
The ACL contains entries that are not unique.
.El
.Sh STANDARDS
IEEE Std 1003.1e draft 17 (\(lqPOSIX.1e\(rq, abandoned)
.Sh SEE ALSO
.Xr acl_check 3 ,
.Xr acl_set_file 3 ,
.Xr acl 5
.Sh AUTHOR
Derived from the FreeBSD manual pages written by
.An "Robert N M Watson" Aq rwatson@FreeBSD.org ,
and adapted for Linux by
.An "Andreas Gruenbacher" Aq andreas.gruenbacher@gmail.com .
